[core] Prune value columns when building lookup files for PersistPositionProcessor - #9374
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JingsongLi merged 1 commit intoAug 25, 2026
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…ly processor Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Purpose
close #9373
Tests
Added MergeTreeCompactManagerFactoryTest#testLookupValueProjection to verify that position-only lookup readers prune value columns without modifying the original reader builder.